Can someone please help me<3?

Initially 100 milligrams of a radioactive substance was present. after 6 hours the mass had decreased by 4%. if the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. (round your answer to one decimal place.)

Which of the following graphs could represent a cubic function?

Use the drop-down menus to complete the statements to match the information shown by the graph.